#include <stdio.h>

int main(int argc, char const *argv[]) {
    if (argc < 2) {
        printf("Need at least one argument\n");
        return 1;
    }

    FILE *fp = fopen(argv[1], "r");
    if (fp == NULL) {
        printf("Can't open %s\n", argv[1]);
        return 1;
    }

    char c = 0, bracket = 0;
    while ((c = getc(fp)) != EOF) {
        switch (c) {
            case '<':
            case '>':
            case '+':
            case '-':
            case '.':
            case ',':
            break;
            case ']':
            bracket--;
            if (bracket < 0) {
                goto end;
            }
            break;
            case '[':
            bracket++;
            break;
        }
    }
    end:

    if (bracket != 0) {
        return 1;
    }

    return 0;
}